Optimal strategies for the control of a train
Automatica (Journal of IFAC)
Feedback control systems (4th ed.)
Feedback control systems (4th ed.)
TCP Performance over Wireless MIMO Channels with ARQ and Packet Combining
IEEE Transactions on Mobile Computing
Brief paper: Analysis of networked control systems with drops and variable delays
Automatica (Journal of IFAC)
Train-Ground Communication in CBTC Based on 802.11b: Design and Performance Research
CMC '09 Proceedings of the 2009 WRI International Conference on Communications and Mobile Computing - Volume 02
Brief paper: Local energy minimization in optimal train control
Automatica (Journal of IFAC)
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Communication-based train control (CBTC) uses wireless networks, such as wireless local area networks (WLANs), to transmit trains status and control commands. CBTC systems have stringent requirements for train-ground communications, as the train control system depends on the accurate, timely and reliable data over the communication links. However, since WLANs are not originally designed for high mobility environment, random packet delay and losses are inevitable in WLAN-based CBTC systems, which could result in unnecessary traction, brake or even emergency brake of trains, losses of line capacity and passenger satisfaction. In this paper, we study the impacts of random packet delay on the performance of CBTC systems, and propose a novel scheme to improve the CBTC performance by mitigating the impacts of random packet delay. Unlike the existing works that only consider a single train, we consider a group of trains in CBTC systems to improve the CBTC performance. Extensive field test and simulation results are presented. We show that the current adopted control scheme in CBTC systems needs to keep stability and performance under transmission delays through increasing the distance between trains in steady state which means cost of line capacity. By contrast, our proposed scheme can significantly improve the CBTC performance.